Make sure all files you want to keep on your phone (like photos or music files) have been backed up for using Samsung Kies, Dropbox, and the like. Follow these steps:

1. Tap Apps from the Home screen.

2. Tap Settings.

3. Scroll to and tap Cloud under Settings.

4. Scroll to and tap Device backup under Cloud.

5. Scroll to and tap Restore under Back up and restore.
6. You will then be prompted with the downloading data pop-up message to retrieve data from Samsung account. Allow your phone to retrieve your backed up data.

7. You will then see the available items to be restored. Tap to check the items you want to restore, then tap the button to Restore Now, located beneath the screen.